The 4% Rule: Does It Still Work in 2026?
Yes, the 4% rule still works as a starting point — but for early retirees targeting a 40-year or longer retirement, the research supports a more conservative 3.3%–3.5% withdrawal rate to maintain a 90%+ historical success rate.
Where the 4% Rule Came From
William Bengen published the original research in 1994 in the Journal of Financial Planning. He analyzed every 30-year rolling period from 1926 to 1992 and found that a retiree who withdrew 4% of their initial portfolio in year one, then adjusted that dollar amount for inflation each subsequent year, never ran out of money in any historical 30-year window with a portfolio of at least 50% equities.
Four years later, in 1998, Cooley, Hubbard, and Walz published what became known as the Trinity Study. They extended Bengen's work by analyzing different asset allocations and withdrawal rates across 15-, 20-, 25-, and 30-year periods. For a 30-year retirement with a 75% stock / 25% bond allocation, a 4% withdrawal rate succeeded in about 95% of historical periods. The Trinity Study was updated in 2021, and 4% still held at similar success rates.
Bengen himself later raised his estimate to 4.5%–4.7% after accounting for small-cap stocks, but 4% became the round number that stuck.
The Problem with 40+ Year Retirements
The original research modeled 30-year retirements — designed for someone retiring at 65 and planning to age 95. If you retire at 45, 50, or even 55, you're looking at a 40- to 50-year retirement horizon. Historically, that changes the math considerably.
For a 40-year retirement, research by Wade Pfau and others suggests the safe withdrawal rate drops to approximately 3.3%–3.5% for a 90% historical success rate. For a 50-year retirement, some studies suggest going as low as 3.0%.
The practical implication: if you plan to retire at 45 and spend $60,000 per year, a 4% rule implies a $1.5 million portfolio. A 3.3% rate implies you need closer to $1.82 million — about $320,000 more — to sustain the same spending with comparable historical safety.
Sequence of Returns Risk
The biggest threat to the 4% rule is not average returns — it's the sequence in which returns arrive. If you retire and the market drops 40% in your first two years (as it did in 2000–2002 and 2008–2009), you're selling more shares to fund the same withdrawal. That permanently shrinks the portfolio base that needs to recover.
A retiree who experienced 2000–2002 in their first years of retirement saw a dramatically worse outcome than someone who retired in 1997 and experienced those same losses mid-retirement, even if their 30-year average return was identical. This is why some planners argue the first 5–10 years of retirement are the most critical period for portfolio survival.
The 4% rule survived sequence of returns risk in every historical 30-year period because no historical bad sequence was quite as bad as a complete permanent loss — though Japan's 1990 peak offers a sobering counter-example for international markets.
Kitces on the Rising Equity Glidepath
Michael Kitces, a prominent financial planning researcher, has argued that the conventional wisdom of reducing equity exposure in retirement may actually increase sequence-of-returns risk. His research suggests that a "rising equity glidepath" — starting retirement with a relatively conservative 40–50% equity allocation and gradually increasing to 60–70% over the first 10–15 years — outperforms the traditional declining-equity approach.
The logic: if markets crash early in retirement, a conservative allocation means you're selling fewer shares of the depressed assets. As the portfolio recovers and you've survived the vulnerable early years, you can take on more equity risk to capture growth. Kitces found this approach improved success rates in down-sequence scenarios without meaningfully harming outcomes in favorable sequences.
This research is important because it challenges the standard target-date-fund glide path and suggests retirees — especially early retirees — should think carefully about their equity allocation strategy rather than defaulting to the most conservative positioning.
Practical Adjustments for 2026
The 4% rule assumes you take the same inflation-adjusted dollar amount every single year regardless of market performance. In practice, almost no retiree does this. Dynamic withdrawal strategies — where you reduce spending by 10–15% in years following poor market performance and allow increases after good years — can significantly improve portfolio survival rates while maintaining a satisfying lifestyle.
The Guyton-Klinger guardrail rules formalize this approach: if your withdrawal rate rises above 20% of the initial rate (i.e., your portfolio has shrunk enough that you're effectively withdrawing 4.8% against original value), you cut spending by 10%. If your withdrawal rate falls below 20% of the initial rate (portfolio has grown substantially), you can increase spending by 10%.
For 2026, with equity valuations measured by the Shiller CAPE ratio remaining elevated relative to historical averages, some advisors recommend stress-testing plans against a 3.5% initial withdrawal rate and using flexibility as a buffer rather than reducing the initial rate aggressively.
Try the Calculator
Calculate Your Safe Withdrawal Rate
Frequently Asked Questions
Is the 4% rule still safe in 2026?
Yes, as a starting benchmark for 30-year retirements with 50–75% equity allocations, the 4% rule has survived every historical 30-year period in U.S. market history. For longer retirements (40+ years), a more conservative 3.3%–3.5% initial rate provides comparable historical safety.
What does the 4% rule mean in dollar terms?
The 4% rule means your portfolio should be 25x your annual spending. If you spend $50,000 per year, you need $1.25 million. If you spend $80,000 per year, you need $2 million. You withdraw 4% of the initial value in year one, then adjust that dollar amount for inflation each subsequent year.
What is the safe withdrawal rate for a 40-year retirement?
Research by Wade Pfau and others suggests 3.3%–3.5% for a 40-year retirement at a 90%+ historical success rate with a 60–75% equity allocation. This implies a portfolio of approximately 28–30x annual expenses rather than the 25x implied by the 4% rule.
Did the Trinity Study update change the 4% rule?
The 2021 Trinity Study update confirmed that 4% continues to work for 30-year retirements at high success rates with significant equity allocations. The update used more recent data through 2020, including periods of lower bond yields, and the conclusion remained broadly the same.
How does inflation affect the 4% rule?
The 4% rule explicitly accounts for inflation — you increase your withdrawal amount each year by the inflation rate. Historically, this has worked because equity returns have outpaced inflation over long periods. Sustained high inflation (above 5–6% for multiple years) is the scenario most dangerous to a fixed withdrawal strategy, which is one reason flexible spending rules have gained favor.
Related Calculators
Related Articles
What decision is on your mind?
Get a confident answer in under 60 seconds. No spreadsheets, no fees.
Model My Decision →